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Groundsmaster 4000--D/4010--D Hydraulic SystemPage 4 -- 33
Lift Circuit Problems
Problem Possible Cause
Cutting decks will not raise.
NOTE: Seat must be occupied in or-
der to raise cutting decks.
Engine RPM is too low.
Hydraulic oil level in reservoir is low.
Solenoid valve (S1) in lift/lower manifold is faulty.
Electrical problem exists (see Chapter 5 -- Electrical System).
Lift arm pivots are binding.
Relief valve in lift/lower manifold is stuck.
Lift cylinder(s) is (are) damaged.
Gear pump section for lift circuit is inefficient (NOTE: steering circuit
impacted as well).
Cutting decks raise, but will not stay
up.
NOTE: Lift cylinders cannot provide
an absolutely perfect seal. The cut-
ting deck will eventually lower if left
in the raised position during storage.
Lift circuit lines or fittings are leaking.
Lift cylinder is damaged.
Cartridge valve(s) in lift/lower manifold has damaged seals or is
faulty.
Cutting decks will not lower.
NOTE: To lower a cutting deck, the
seat must be occupied and the trac-
tion speed must be in the Low
(4WD) position.
Lift arm pivots are binding.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve (S1) in lift/lower manifold is faulty.
Counterbalance pressure is excessive.
Lift cylinder is damaged.
Hydraulic
System